Post-dural puncture headache.
D000775:Anesthesia, Spinal / Q000009:adverse effects*; D017217:Blood Patch, Epidural; D004388:Dura Mater / Q000293:injuries*; D006261:Headache / Q000209:etiology*; D006801:Humans; D013129:Spinal Puncture / Q000009:adverse effects